<!--
 * @Author: Bo Cai
 * @Mail: caibo0520@qq.com
 * @Date: 2021-10-07 17:21:46
 * @LastEditors: Bo Cai
 * @LastEditTime: 2021-12-21 00:08:09
-->
<template>
    <div class="app-container">
        <!-- 添加和修改章节表单 -->
        <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
            <el-form :model="chapter" label-width="120px">
                <el-form-item label="章节标题">
                    <el-input v-model="chapter.title" />
                </el-form-item>
                <el-form-item label="章节排序">
                    <el-input-number
                        v-model="chapter.sort"
                        :min="0"
                        controls-position="right"
                    />
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogChapterFormVisible = false"
                    >取 消</el-button
                >
                <el-button type="primary" @click="saveOrUpdate"
                    >确 定</el-button
                >
            </div>
        </el-dialog>
        <!-- 添加和修改课时表单 -->
        <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
            <el-form :model="video" label-width="120px">
                <el-form-item label="课时标题">
                    <el-input v-model="video.title" />
                </el-form-item>
                <el-form-item label="课时排序">
                    <el-input-number
                        v-model="video.sort"
                        :min="0"
                        controls-position="right"
                    />
                </el-form-item>
                <el-form-item label="上传视频">
                    <el-upload
                        :on-success="handleVodUploadSuccess"
                        :on-remove="handleVodRemove"
                        :before-remove="beforeVodRemove"
                        :on-exceed="handleUploadExceed"
                        :file-list="fileList"
                        :action="BASE_API + '/vod/video/upload'"
                        :limit="1"
                        class="upload-demo"
                    >
                        <el-button size="small" type="primary"
                            >上传视频</el-button
                        >
                        <el-tooltip placement="right-end">
                            <div slot="content">
                                最大支持1G，<br />
                                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br />
                                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br />
                                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br />
                                SWF、TS、VOB、WMV、WEBM 等视频格式上传
                            </div>
                            <i class="el-icon-question" />
                        </el-tooltip>
                    </el-upload>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogVideoFormVisible = false"
                    >取 消</el-button
                >
                <el-button
                    :disabled="saveVideoBtnDisabled"
                    type="primary"
                    @click="saveOrUpdateVideo"
                    >确 定</el-button
                >
            </div>
        </el-dialog>
        <h2 style="text-align: center">发布新课程</h2>
        <el-steps
            :active="2"
            process-status="wait"
            align-center
            style="margin-bottom: 40px"
        >
            <el-step title="填写课程基本信息" />
            <el-step title="创建课程大纲" />
            <el-step title="提交审核" />
        </el-steps>
        <el-button type="text" @click="dialogChapterFormVisible = true"
            >添加章节</el-button
        >
        <!-- 章节 -->
        <ul class="chanpterList">
            <li v-for="chapter in chapterNestedList" :key="chapter.id">
                <p>
                    {{ chapter.title }}

                    <span class="acts">
                        <el-button
                            type="text"
                            @click="
                                dialogVideoFormVisible = true
                                chapterId = chapter.id
                            "
                            >添加课时</el-button
                        >
                        <el-button type="text" @click="editChapter(chapter.id)"
                            >编辑</el-button
                        >
                        <el-button type="text" @click="removeChapter(chapter.id)"
                            >删除</el-button
                        >
                    </span>
                </p>

                <!-- 视频 -->
                <ul class="chanpterList videoList">
                    <li v-for="video in chapter.children" :key="video.id">
                        <p>
                            {{ video.title }}
                            <span class="acts">
                                <el-button
                                    type="text"
                                    @click="editVideo(video.id)"
                                    >编辑</el-button
                                >
                                <el-button
                                    type="text"
                                    @click="removeVideo(video.id)"
                                    >删除</el-button
                                >
                            </span>
                        </p>
                    </li>
                </ul>
            </li>
        </ul>
        <div>
            <el-button @click="previous">上一步</el-button>
            <el-button :disabled="saveBtnDisabled" type="primary" @click="next"
                >下一步</el-button
            >
        </div>
    </div>
</template>

<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'
import vod from '@/api/edu/vod'

export default {
    data() {
        return {
            courseId: '', // 所属课程
            chapterNestedList: [], // 章节嵌套课时列表
            saveBtnDisabled: false, // 保存按钮是否禁用
            dialogChapterFormVisible: false, //是否显示章节表单
            chapter: {
                // 章节对象
                title: '',
                sort: 0,
            },
            saveVideoBtnDisabled: false, // 课时按钮是否禁用
            dialogVideoFormVisible: false, // 是否显示课时表单
            chapterId: '', // 课时所在的章节id
            video: {
                // 课时对象
                title: '',
                sort: 0,
                free: false,
                videoSourceId: '',
                videoOriginalName: '',
            },
            fileList: [], //上传文件列表
            BASE_API: process.env.BASE_API, // 接口API地址
        }
    },

    created() {
        this.init()
    },

    methods: {
        handleVodUploadSuccess(response, file, fileList) {
            this.video.videoSourceId = response.data.videoId
            this.video.videoOriginalName = file.name
        },
        init() {
            if (this.$route.params && this.$route.params.id) {
                this.courseId = this.$route.params.id
                // 根据id获取课程基本信息
                this.fetchChapterNestedListByCourseId()
            }
        },
        fetchChapterNestedListByCourseId() {
            chapter.getNestedTreeList(this.courseId).then((response) => {
                this.chapterNestedList = response.data.items
            })
        },
        previous() {
            this.$router.push({ path: '/course/info/' + this.courseId })
        },
        next() {
            this.$router.push({ path: '/course/publish/' + this.courseId })
        },
        saveOrUpdate() {
            this.saveBtnDisabled = true
            if (!this.chapter.id) {
                this.saveData()
            } else {
                this.updateData()
            }
        },
        beforeVodRemove(file, fileList) {
            return this.$confirm(`确定移除 ${file.name}？`)
        },
        handleVodRemove(file, fileList) {
            vod.removeById(this.video.videoSourceId).then((response) => {
                this.video.videoSourceId = ''
                this.video.videoOriginalName = ''
                this.fileList = []
                this.$message({
                    type: 'success',
                    message: response.message,
                })
            })
        },
        saveOrUpdateVideo() {
            this.saveVideoBtnDisabled = true
            if (!this.video.id) {
                this.saveDataVideo()
            } else {
                this.updateDataVideo()
            }
        },
        saveData() {
            this.chapter.courseId = this.courseId
            chapter
                .save(this.chapter)
                .then((response) => {
                    this.$message({
                        type: 'success',
                        message: '保存成功!',
                    })
                    this.helpSave()
                })
                .catch((response) => {
                    this.$message({
                        type: 'error',
                        message: response.message,
                    })
                })
        },
        saveDataVideo() {
            this.video.courseId = this.courseId
            this.video.chapterId = this.chapterId
            video.saveVideoInfo(this.video).then((response) => {
                this.$message({
                    type: 'success',
                    message: '保存成功!',
                })
                this.helpSaveVideo()
            })
        },
        updateData() {
            chapter
                .updateById(this.chapter)
                .then((response) => {
                    this.$message({
                        type: 'success',
                        message: '修改成功!',
                    })
                    this.helpSave()
                })
                .catch((response) => {
                    this.$message({
                        type: 'error',
                        message: response.message,
                    })
                })
        },
        updateDataVideo() {
            video.updateVideoInfoById(this.video).then((response) => {
                this.$message({
                    type: 'success',
                    message: '修改成功!',
                })
                this.helpSaveVideo()
            })
        },
        helpSave() {
            this.dialogChapterFormVisible = false // 如果保存成功则关闭对话框
            this.fetchChapterNestedListByCourseId() // 刷新列表
            this.chapter.title = '' // 重置章节标题
            this.chapter.sort = 0 // 重置章节标题
            this.saveBtnDisabled = false
        },
        helpSaveVideo() {
            this.dialogVideoFormVisible = false // 如果保存成功则关闭对话框
            this.fetchChapterNestedListByCourseId() // 刷新列表
            this.video.title = '' // 重置章节标题
            this.video.sort = 0 // 重置章节标题
            this.video.videoSourceId = '' // 重置视频资源id
            this.video.videoOriginalName = ''
            this.video.free = false
            this.saveVideoBtnDisabled = false
            this.fileList = []
        },
        editChapter(chapterId) {
            this.dialogChapterFormVisible = true
            chapter.getById(chapterId).then((response) => {
                this.chapter = response.data.item
            })
        },
        editVideo(videoId) {
            this.dialogVideoFormVisible = true
            video.getVideoInfoById(videoId).then((response) => {
                this.video = response.data.item
                this.fileList = [{ name: this.video.videoOriginalName }]
            })
        },
        removeChapter(chapterId) {
            this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning',
            })
                .then(() => {
                    return chapter.removeById(chapterId)
                })
                .then(() => {
                    this.fetchChapterNestedListByCourseId() // 刷新列表
                    this.$message({
                        type: 'success',
                        message: '删除成功!',
                    })
                })
                .catch((response) => {
                    // 失败
                    if (response === 'cancel') {
                        this.$message({
                            type: 'info',
                            message: '已取消删除',
                        })
                    } else {
                        this.$message({
                            type: 'error',
                            message: response.message,
                        })
                    }
                })
        },
        removeVideo(videoId) {
            this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning',
            })
                .then(() => {
                    return video.removeById(videoId)
                })
                .then(() => {
                    this.fetchChapterNestedListByCourseId() // 刷新列表
                    this.$message({
                        type: 'success',
                        message: '删除成功!',
                    })
                })
                .catch((response) => {
                    // 失败
                    if (response === 'cancel') {
                        this.$message({
                            type: 'info',
                            message: '已取消删除',
                        })
                    }
                })
        },
        //视图上传多于一个视频
        handleUploadExceed(files, fileList) {
            this.$message.warning('想要重新上传视频，请先删除已上传的视频')
        },
    },
}
</script>
<style scoped>
.chanpterList {
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li {
    position: relative;
}
.chanpterList p {
    float: left;
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #ddd;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList {
    padding-left: 50px;
}
.videoList p {
    float: left;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #ddd;
}
</style>